علی اشتری اصفهانی

KArlsruhe TRItium Neutrino Experiment *

و

محدثه خوش‌طینت

(دانشکده فیزیک دانشگاه صنعتی شریف)

The neutrino’s mass conundrum: Can cosmology resolve the mystery? **

*Abstract: Recently the KATRIN experiment made the cover of Nature physics by measuring the first sub-eV limit on the effective neutrino mass. In this talk, we first briefly present the neutrino mass question and the areas of physics in which we can search for an answer. Then we introduce the MAC-E filter technology used in the KATRIN experiment. Next, we explain the KATRIN beamline which includes the source, transport section, spectrometers, and detectors. Finally, the analysis method and the systematic effects of the recent result will be discussed.

**Abstract: After decoupling, neutrinos stream freely. But how? It depends on the mass Nature assigned to them. In this talk, we will follow the massive neutrinos timeline and explore the impacts their mass has on the evolution of the Universe, mainly on the Large Scale Structure (LSS). Then we will investigate what cosmological data sets could say about the neutrino’s properties, especially their mass. Inferring parameters from some of these data sets are straightforward – e.g., CMB-anisotropy, but the information in others needs to be deciphered – for example, the LSS data. Our journey will end with a summary of the methods used in the Cosmic Web Group to study the latter to find the neutrino’s footprint.